Gmail Labs released a new feature last night called Mail Goggles . If you enable Mail Goggles for your account it prompts you to solve some simple math problems to ensure you are in the right state of mind to send an email on those late nights when you probably shouldn't be sending email anyway. You can read more about it at the Gmail Labs Blog, but I have to say, I thought this was a joke when I read it.
Google is well known for their April Fools day jokes and this totally seemed like one of them. I even had to look at my calendar and think hard about what day it was (It's been a rough morning I'm not even sure I'm awake.). But, after careful examination it appears to be legit, so if you're a Gmail user check it out. It might be right up your alley.
If Beer, I mean mail, Goggles doesn't appeal to you Gmail Labs has several other possibly more useful features that might interest you. I enabled a feature that moves my chat and label boxes to the right side of the screen. It's kind of cool and helps me not to have to scroll down in my browser window as much.